Outdated Exemption List, Subchapter Q - December 24, 1998Synopsis of specific exemptions from air permitting that were in effect on this date.https://www.tceq.texas.gov/permitting/air/permitbyrule/historical_rules/old106list/1298/q.htmlhttps://www.tceq.texas.gov/@@site-logo/tceqlogo-3colors.gif

Outdated Exemption List, Subchapter Q - December 24, 1998

Synopsis of specific exemptions from air permitting that were in effect on this date.

Presses used for the curing of rubber products and plastic
products are exempt.

106.392 Thermoset Resin
Facilities (Previously SE 113)

Facilities using thermoset resins (excluding resins that do
not emit air contaminants) to manufacture or repair products are
exempt, provided that the following conditions of this section are
satisfied for paragraph (1) and either paragraph (2) or (3) of this
section.

(1) The following requirements shall apply to all thermoset
resin facilities.

(A) Before construction begins, the facility must be
registered with the commission using Form PI-7.

(B) Records of resin and acetone usage shall be kept on a
monthly and calendar year-to-date basis to show compliance with
this section, and shall be maintained for the most recent 24
months.

(C) All resin spraying and cleaning operations shall be
conducted between two hours before sunrise and two hours after
sunset. The exhaust fan(s) must be operating during and for at
least 30 minutes after any usage of resin and/or cleaning solvents.

(D) All solid trim grinding operations shall be vented through
a dry filter system or a water wash system which has a particulate
removal efficiency of at least 95%. Particulates trapped in the dry
filter system or water wash sludge shall be handled and stored in a
way to minimize the escape of fugitive dust emissions.

(E) No more than five tons of acetone shall be used per year
(gross usage minus waste disposal).

(2) The following requirements shall apply to facilities that
have spraying operations (the facilities may include non-spraying
operations).

(A) No more than 75 tons of resin and gelcoat combined shall
be used per year (gross usage minus waste disposal).

(B) All resin spraying operations shall be conducted in a
booth or an enclosed work area and the emissions shall be exhausted
through elevated stack(s). All stacks shall discharge vertically to
the atmosphere with no restrictions or obstructions to flow. Each
stack shall meet one of the following minimum requirements:

(i) a flow rate of 20,000 actual cubic feet per minute (acfm)
and the greater of six feet above the peak of the manufacturing
building or 25 feet above ground level; or

(ii) a flow rate of 15,000 acfm and the greater of six feet
above the peak of the manufacturing building or 30 feet above
ground level.

(C) No more than 1,000 pounds per year of resin shall be used
outdoors.

(D) If annual resin usage is less than 1,000 pounds, a
facility is exempt from all requirements of this section except
recordkeeping (paragraph (1)(B) of this section).

(3) The following requirements shall apply only to
non-spraying operations.

(A) No more than 150 tons of resin and gelcoat combined shall
be used per year (gross usage minus waste disposal).

(B) All resin operations shall be conducted in a booth or an
enclosed work area or the manufacturing building and the emissions
shall be exhausted through elevated stack(s). All stacks shall
discharge vertically to the atmosphere with no restrictions or
obstructions to flow. Each stack shall meet one of the following
minimum requirements:

(i) a flow rate of 20,000 acfm and the greater of six feet
above the peak of the manufacturing building or 25 feet above
ground level; or

(ii) a flow rate of 15,000 acfm and the greater of six feet
above the peak of the manufacturing building or 30 feet above
ground level.

(C) No more than 3,000 pounds per year of resin shall be used
outdoors.

(D) If annual resin usage is less than 3,000 pounds, a
facility is exempt from all requirements of this section except
recordkeeping (paragraph (1)(B) of this section).

Equipment used exclusively for conveying and storing plastic
and/or rubber solid materials is exempt, provided that no visible
emissions occur and all the conditions of this section are met:

(1) equipment used for conveying of powders or resins to
storage silos must be equipped with fabric filter(s) having a
maximum filtering velocity of 4.0 feet per minute (ft/min) with
mechanical shaking or 7.0 ft/min with air cleaning; and

(2) transfer of powders or resins is accomplished in an
enclosed system.

106.394 Plastic Compression
and Injection Molding (Previously SE 45)

Equipment used for compression molding and injection molding
of plastics is exempt.

Mixers, blenders, roll mills, or calenders for rubber or
plastics are exempt, provided the following conditions of this
section are satisfied. Mixers, blenders, roll mills, or calenders
handling or adding asbestos shall not be eligible for exemption
under this section.

(1) Organic solvents, diluents, or thinners shall not be used.

(2) Material in powder form shall not be added unless the
mixer, blender, roll mill, or calender is vented to a fabric filter
having a maximum filtering velocity of 4.0 feet per minute (ft/min)
with mechanical cleaning, or 7.0 ft/min with automatic air
cleaning.

Roll mills or calenders for rubber or plastics in which
organic solvents, diluents, or thinners are used are exempt,
provided that before construction begins, the facility is
registered with Form PI-7 and information regarding process rate
and type of material emitted is submitted.